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Self-reduction Mechanism of Coal Composite stainless steel dust Hot Briquette

Journal of Iron and steel Research(International) 2016年第4期23卷 314-321页

作者： Sok-chol RI Man-sheng CHU Shuang-yin CHEN Zheng-gen LIU Hun HONG School of Metallurgy Northeastern University School of Metallurgical Engineering Kim Chaek University of Technology

To efficiently recycle valuable metals such as chromium and nickel in stainless steel dust, self-reduction ex- periments were carried out to study the reduction mechanism of metal oxides in coal composite stainless steel dust hot briquette, which is defined as a CCSB here. Self-reduction of CCSB is proceeded by volatile matter and fixed carbon contained within CCSB. Experiments were performed to study the effects of temperature and carbon to oxygen （C/OCoal） ratio on self reduction of CCSB. At 1400 and 1450℃, volatile matter in coal used for experiment could take the place of about 40℃ of fixed carbon in coal. Under the present experimental conditions, reduction product of chromium appears as FeCr2O2, Cr2O3, Cr7C3 , and [Cr] in turn during reduction. To evaluate the formation of met al nuggets in self reduction process of CCSB, metal nuggets containing chromium and nickel were observed in outside of reduction products under various conditions, and thermodynamic equilibrium calculation was carried out for possi hie products and formation of molten metal by fixed carbon. SEM and EDS analyses were made for metal nugget and slag in reduced product. The results reveal that it is reasonable to achieve the metal nuggets at 1450℃, 0.8 of C/OCoal ratio and 20 min of reduction time. The nugget formation can indicate one innovative process for comprehensive utilization of stainless steel dust.

关键词： stainless steel dust coal composite hot briquette self reduction metal nugget

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Recovery rates of iron, nickel, and chromium via iron-bath reduction of stainless steel dust briquettes based on corundum crucible erosion balance analysis

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Journal of Iron and steel Research(International) 2018年第3期25卷 320-329页

作者： Fei Yuan Hui-ning Zhang Hui Li Jian-hong Dong Hui-hui Xiong An-jun Xu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083 China School of Metallurgy and Chemical Engineering Jiangxi University of Science and TechnologyGanzhou 341000 Jiangxi China China Metallurgical Industry Planning and Research Institute Beijing 100083 China

The leaching of chromium from stainless steel dust （SSD） is deleterious to the environment. To address this issue, the reduction of SSD briquettes can be employed to effectively extract chromium. The recovery rates of iron, chromium, and nickel via ironbath reduction of SSD briquettes were determined using X-ray fluorescence spectroscopy, X-ray diffraction, and scanning electron microscopy measurements. First, the effects of basicity and contents of silicon, iron, CaF2, and carbon on the recovery rates of the three metals were analyzed using the slag amount prediction model, which was originally established from the A1203 balance of corundum crucible erosion behavior. Second, the effect of feeding mode, i.e., whether steel scrap and SSD briquettes were simultaneously added, on the recovery rates was discussed in detail. Third, the iron-bath reduction of SSD briquettes was thermodynamically analyzed. The results indicated that the recovery rates of the three metals are greater than 95% those of using a basicity of 1.5 and 6.0% CaF2, 15% carbon, and 7% ferrosilicon. The recovery rate of chromium increases twofold with the addition of ferrosilicon. The feeding mode of adding briquettes and steel scrap simultaneously is better for recovery of metals and separation of the metal and slag than the feeding mode of adding steel scrap firstly and then briquettes.

关键词： stainless steel dust Erosion model Ferrosilicon Iron Nickel-Chromium Recovery Iron-bath reduction

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Reduction of Cr during Smelting Treatment of stainless steel dust

Reduction of Cr during Smelting Treatment of Stainless Steel...

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“第十届中国钢铁年会”暨“第六届宝钢学术年会”

作者： Zhang Yanling Jia Xinlei Guo Wenming State Key Laboratory of Advanced Metallurgy University of Science and Technology

Staniless steel dust contains a remarkable content of Cr oxides which is *** a practical method,Smelting treatment is chosen to recover Cr resource in stainless steel *** of Cr between the recovered melt and the residual slag phase depends on the activity coefficient of Cr in the metal phase（Crγ）and the activity coefficient of Cr O in the slag（Cr Oγ）.Both Crγin Fe-Cr-Ni-C（-Si/Al）melt and Cr Oγin Ca O-Si O2-Mg O-Al2O3slag under different situations were firstlypredicted through thermodynamic *** research on reduction of Cr during smelting treatment of stainless steel dust was performed in this *** suggested that the recovery ratios of valuable metals increased with increasing%Ca O/%Si O2of the residual slag to 1.17 and then decreased.A good linear relationship betweenthe apparent distribution ratio of Cr（m/s Cr L）and Cr O Crγ/γwas observed.

关键词： stainless steel dust activity coefficient partition ratios chromium

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The sustainability of valuable metals—recycling of residues from stainless steel production

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Baosteel Technical Research 2010年第S1期4卷 136-页

作者： Kristina BESKOW Andreas RUH Christoffer LUNDSTRM Uan Hagfors Teknologi AB Djursholmsvgen 30 SE-18352 TbySweden Befesa steel Services GmbH Albert-Hahn-Str.9 47269 DuisburgGermany

The European stainless steel producers generate 20 -30 kg dust per ton of produced stainless *** dust formed during various stages of the production process contains valuable metals such as Cr,Ni and *** general this dust is considered as a hazardous *** not taken care of the dust will be an environmental risk causing potential problems such as leaching of heavy metals into groundwater and pollution of land and *** applying techniques for recycling the dust the problem is minimized and valuable metals are recovered and re-used as raw material in the steel making process,leading to a significant reduction of the consumption of natural resources to decelerate the climate change and ensure a sustainable *** of the business segments of Befesa Zinc S.L.U.,a subsidiary company of Abengoa,is the recycling of dusts and other residues containing nickel,chromium and molybdenum from the stainless steel *** technologies applied are submerged arc reduction smelting(Befesa Valera S.A.S.,Gravelines,France) and plasma reduction smelting(Befesa Scandust AB,Landskrona,Sweden).stainless steel plant dusts,mill scale and other residues are delivered in closed containers and big bags by ship,rail or truck and *** a preparation of the residues and charging into the pyrometallurgical furnace,the metal compounds contained in the charge are reduced to metals in the presence of the carbon *** Befesa Scandust,the regularly tapped liquid metal is cast in the form of granules via the Granshot^(?) granulation *** granulated product has many advantages such as excellent preheating properties and fast melting when added to a metallurgical *** granules size and shape also makes it very suitable to handle with most raw material handling *** granulating the so-called alloyed pig iron(API) a high metallic yield is achieved ensuring maximum recovery of metal and less new dust generation compared to a crushed *** granules

关键词： recycling stainless steel dust Befesa Granshot metal granulation sustainable development

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